Improvement in tilting chairs



P. NILSQN.

TILTING-CHAIR. 77 35 Patented May16,18 76.

. seat A by a bracket, a.

UNITED-"STAT S PATENT OFFioE.

PETER NILSON, OF PHILADELPHIA, PENNSYLVANIA.

lMPRO VEMENT m TILTING CHAIRS.

Speoification forming part of Letters Patent No. 177,350, dated May 16, 1876; application filedv I September 18, 1875. v

To all whom it may concern:

Be it known that I, PETER NILsoN, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Tilting Chairs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inthe art to which it pertains to make and use it,

. reference beinghad to the accompanying drawv A, in the accompanying drawing, represents a chair-seat, and B B the legs, sustaininga screw, 1), on which is supported a spider, O.-

The spider O has two lateral arms, 0 c,transverse to which are two other arms, 0 and 0 The arms 0 0 have hearings in lugs or boxes at a, affixed to the under side of the seat A, enabling the seat to be rocked or tilted in the customary manner. The arm 0 curves upwardly, so as to meet the chair-seat A when the latter is in a horizontal position, while the arm 0 has a reverse downward curve. D is the spring, having ends D and D bent toward each other. This spring is securedto the arm 0 by the loop 01, adjustable thereon by means of a set-screw, d, and to the chair- E represents a yoke, and e an adjusting-screw connecting the ends 01 d of the spring D, and affording means for varying the tension or stiffness of said spring according to the weight of the occupant of the chair. This yoke and adjusting-screw may be wholly dispensed with, if desired, not being absolutely necessary, except for the purpose indicated. The stiffness of the spring may be also varied by moving the loop 01 nearer to or farther from the screw b. If desired, the spring may be strengthenedby the addition of one or more supplementary leaves, the forward extremity thereof extending far enough only to find a bearing under the loop (I, and not curvin g upward sufficiently to meet the end 01 c justed to suit a light body, and-a heavy vperson should take the chair. F representsa button, pivoted to the chair seat A by means of a screw, f, turning freely on the neck thereon;

, :VVhen said button is turned as shown in'Fig.

1, it engages with the forward extremity of the arm 0 holding the latter in closecontact I with the seat A, and preventing said seat from being tilted. When turned to one side or around, as shown in dotted lines in said figure, the button does not engage with the arm 0 and the seat may then be tilted at will. This locking and unlocking of the seat may be readily accomplished bythe occupant of the chair without rising from his position.

4 What I claim is- 1. The spider 0, having lateral arms a c and arms 0 transverse thereto, the arm-c 'curving upwardly to meet the chair-seat, and the arm c having a reverse downward curve, substantially as shown and described.

2. The spring D, secured to the spider O in advance of the center of the latter,'aud to the chair-seat A in rear of the centralline of said seat.

3. The spring. D, havingcurved ends D and D united by a yoke or equivalent means,

substantially as set forth.

4. In combination with the curved spring D, the yoke E, and adj Listing-screw c, substantially as shown and set forth.

In testimony that I'claim the foregoing I have hereunto'set my hand this 25th day of August, 1875. r

1 PETER NILSON.

Witnesses:

M. DANL. ,GO'NNOLLY, GEO. G. SHELMERDINE. 

